Tesla CAN Horn

1#include <Arduino_CAN.h>
2//This Code Honks the horn of a Tesla when a button is pressed on D6
3#define BUTTON_PIN D6
4#define HONK_TIME_MS 50
5#define CAN_ID_HONK 0x273
6bool lastButtonState = HIGH;
7
8void setup() {
9  // Serial is optional; do not block startup
10  Serial.begin(115200);
11
12  pinMode(BUTTON_PIN, INPUT_PULLUP); // button wired D6 → GND
13
14  if (!CAN.begin(CanBitRate::BR_500k)) //Check if CAN started up fine
15  {
16    while (1); // hard fail
17  }
18}
19
20void loop() {
21  bool buttonState = digitalRead(BUTTON_PIN); //Read button
22
23  if (buttonState == LOW && lastButtonState == HIGH)   // Detect button press and release
24  {
25    // Build CAN frame
26    CanMsg hornMsg;
27    hornMsg.id = CAN_ID_HONK; // ID273UI_vehicleControl
28    hornMsg.data_length = 8;
29
30    // Zero the 8 bytes
31    for (int i = 0; i < 8; i++) {
32      hornMsg.data[i] = 0;
33    }
34
35    // Bit 61 → byte 7, bit 5
36    hornMsg.data[7] = 0x20;
37
38    // Honk ON
39    CAN.write(hornMsg);
40
41    delay(HONK_TIME_MS);//Horn honks for 
42
43    // Honk OFF
44    hornMsg.data[7] = 0x00;
45    CAN.write(hornMsg);
46    Serial.println("Horn triggered"); 
47  }
48  lastButtonState = buttonState; //Set previous button state
49}